What are differences between PTH VS NPTH

What are differences between PTH VS NPTH
If you have the opportunity to pick up a printed circuit board (PCB) and look at it, you will find that the board is full of holes,they can be big and small. If you hold it up to the lamp, you will find that the light is filled with holes. These holes are designed for different purposes. And the more holes there are, the more expensive the PCB basically becomes.
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    What are PTH VS NPTH

    These holes in the PCB can basically be distinguished from each other by PTH VS NPTH, plating through hole because they actually run from one side of the board to the other. In fact, in addition to the circuit board through the hole, there are other holes not through the circuit board.

    How to distinguish PTH VS NPTH

    In fact, it is very simple to distinguish PTH VS NPTH, just look at the vertical hole wall has bright electroplating marks can be judged, the hole with electroplating marks is PTH, the hole without electroplating marks is NPTH.

    What are functions of PTH VS NPTH

    One function of PTH VS NPTH

    If you look at PTH VS NPTH , you will find that the aperture of NPTH is usually larger than PTH, because NPTH is mostly used as a lock screw, some is used to install some connections outside the connector fixed, some is used for card mechanism.

    some PCBs also design NPTH on the edge of the board

    In addition, some PCBs also design NPTH on the edge of the board (break-away, coupon, broken edge) for testing the positioning of the fixture. In the early days, it was also used to fix the circuit board when SMT production line printing/attaching parts. Now most SMT printing machines use the clamping method instead of thimble to fix the circuit board. However, the thickness of the board is too thin may still need to use NPTH to fix, so as not to clamp deformation.

    Another function of PTH VS NPTH

    Generally, PTH holes in the circuit board are used in two ways. One is used for welding the feet of traditional DIP parts. The aperture of these holes must be larger than the diameter of the welding feet of the parts, so that the parts can be inserted into the holes for welding.

    Another kind of relatively small PTH, usually called via(conduction hole), they are used to connect and conduction the copper foil line between different layers of the circuit board (PCB), because PCB is basically composed of many copper layers stacked and accumulated, the adjacent layer of copper will be laid with a layer of insulation layer between. That is to say, the copper foil layers cannot communicate with each other, and the signal transmission between different copper foil layers depends on via.

    How to protect PTH VS NPTH

    How to protect PTH VS NPTH?

    Most of PTH VS NPTH will cover its surface with green paint to insulate it, especially the mobile phone board. Because the parts on the board become more and more solder, some of PTH VS NPTH will even be placed right below the part. In order to avoid quality or function problems caused by inadvertent short-circuit between the parts and PTH VS NPTH, most of them will use green paint for protection.

    Another purpose is that some PTH VS NPTH will have amount of solder paste printed on them. When the board flows through reflow, the solder paste is likely to flow from via to the other side of the board and cause short circuit problems. Therefore, most of the current PCB processes will make the aperture of via small and then cover it with green paint to avoid possible quality problems in the future. This, of course, had to be done at Gerber’s request.

    Disadvantages of using green paint to protect PTH VS NPTH

    Of course, many people think that the construction method of using green paint to cover the PTH VS NPTH will have quality risks, because there may be incomplete cover holes or chemical residue and corrosion risk, but there is no denying that the use of green paint cover holes is still the cheapest and acceptable way to fill holes.

    In addition to the use of green paint to cover the hole

    In addition to the use of green paint to cover the hole, some people use resin to fill the hole and then use green paint to cover the hole. This method is more in line with the quality requirements, but more than one process, the cost of course has to go up. in addition, if it is a through hole or a void in pad on the pad, we generally require the use of electroplated copper plug holes, and then finished VIPPO (Via-in-pad plated over) to avoid the risk of solder paste flowing into the through hole.

    Conclusion

    Based on the above analysis, I believe you have already gotten a through understanding of the differences of PTH VS NPTH,I hope this can help you in your future work. Feel free to contact us, your reliable PCB manufacturer, if you have any problem.

    FAQ

    These holes in the PCB can basically be distinguished from each other by PTH VS NPTH, plating through hole because they actually run from one side of the board to the other. In fact, in addition to the circuit board through the hole, there are other holes not through the circuit board.
    Most of PTH VS NPTH will cover its surface with green paint to insulate it, especially the mobile phone board. Because the parts on the board become more and more solder, some of PTH VS NPTH will even be placed right below the part. In order to avoid quality or function problems caused by inadvertent short-circuit between the parts and PTH VS NPTH, most of them will use green paint for protection.
    Of course, many people think that the construction method of using green paint to cover the PTH VS NPTH will have quality risks, because there may be incomplete cover holes or chemical residue and corrosion risk, but there is no denying that the use of green paint cover holes is still the cheapest and acceptable way to fill holes.

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